| (19) |
 |
|
(11) |
EP 0 540 182 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.05.1993 Bulletin 1993/20 |
| (43) |
Date of publication A2: |
|
05.05.1993 Bulletin 1993/18 |
| (22) |
Date of filing: 01.10.1992 |
|
| (51) |
International Patent Classification (IPC)5: C08L 67/04
// (C08L67/04, 101:00) |
|
| (84) |
Designated Contracting States: |
|
BE CH DE FR GB IT LI NL SE |
| (30) |
Priority: |
03.10.1991 US 770320
|
| (71) |
Applicant: Camelot Technologies Inc. |
|
Leominster,
Massachusetts 01453 (US) |
|
| (72) |
Inventors: |
|
- Nemphos, Speros P.
Clinton,
Massachusetts 01510 (US)
- Kharas, Gregory B.
Chelmsford,
Massachusetts 01824 (US)
|
| (74) |
Representative: Smaggasgale, Gillian Helen et al |
|
Mathys & Squire,
100 Grays Inn Road
London WC1X 8AL
London WC1X 8AL (GB) |
|
| |
|
| (54) |
Higher heat degradable polymer alloys |
(57) The thermal properties, such as heat distortion temperature of biodegradable polymers,
such as polylactic acid, polyglycolides, polybutyric acid and copolymers of butyric
and valeric acid, may be increased by blending them with a polymer having Tg from
75°C to 200°C and a Hildebrand parameter (σ) of not more than 3 MPA
1/2 different from the biopolymer.